Music MasterWorks
Music MasterWorks is a MIDI music composing program. Allows you to compose music just by singing into your PC microphone. It will also analyze your singing. You can record, edit, playback and print sheet music as well. Compose in either staff or piano roll notation.
http://www.musicmasterworks.com/MusicM382.exe - 2Mb - Download - Screenshot

Lvbs X
This software works as a composer, not as a tool for composing. That is a fundamental difference! Lvbs X composes music - ALL BY ITSELF - without any help from you. Lvbs X composes music. Lvbs X is VIRTUAL MUSIC COMPOSER. You do not have to know anything - ANYTHING AT ALL - about composing,... This music belongs to you. ... THERE IS NO MUSICAL PREDETERMINATIONS AS LOOP-BASED SAMPLES!!! ... Very important: all except the drums, every note of every instrument has its own sample. ... For Lvbs X it is the same!!!
http://www.lvbsx.com/basic/Lvbsx_basic.zip - 16Mb - Download - Screenshot

Noise Station
Noise Station is music creation software. A synthesizer and sequencer, the software is an advanced system for creating professional music with no other equipment needed. Noise station was designed to produce high quality music on any PC by emulation. ... Real time recording doesn't exist, instead events are layed down almost like the music is being programmed, just like in tracker software. ... Fast but low quality previews would be available while composing before producing a final version direct to disk.
http://www.cornutopia.co.uk/software/nssetup.exe - 4Mb - Download - Screenshot

ArtWonk
ArtWonk is a MIDI and graphics program that produces MIDI music and paint graphics based on algorithmic rules that you interactively create by connecting modules (graphical objects that represent functions and processes) in real time, adjusting the parameters as you go, in an interactive drag... ArtWonk is the successor to a long line of graphical, modular, and interactive algorithmic composing programs created by John Dunn that were inspired by the big analog modular synthesizers, going back to one of the first if its kind ever produced for MIDI, MusicBox, released to the public domain in...
http://algoart.com/download/software/artwnk20.zip - 8Mb - Download - Screenshot

QuickScore Elite Level II
QuickScore Elite Level II is Sion Software's premier music composition and notation software - incorporating scoring, arranging, MIDI and audio sequencing and recording. Use it to create publication-quality scores, musical content for the desktop and world wide web, audio CDs, MP3s and... " - Electronic Musician “If you are serious about composing music, QuickScore is the best package that I have ever seen. ... This is the program that Electronic Magazine awarded their 1995 and 1998 Editors' Choice for music notation software.
http://www.sionsoft.com/qse2demo.zip - 4Mb - Download - Screenshot

MidiNotate Composer
MidiNotate Composer provides an easy way to create or arrange your own music. You can write your own music, or you can start with music downloaded from the internet and then arrange it to suit yourself. No matter where your inspiration comes from, Composer will help you produce great-looking... Prepare lessons for music students, arrange church music for the choir each week, write songs to sing with your family, customize music for your instrument, create sheet music for your unique musical group.
http://www.notation.com/MidiNotateComposer10TrialSmallSetup.exe - 5Mb - Download - Screenshot

AKoff Music Composer
AKoff Music Composer is music recognition software which performs Wave to Midi conversion. Composer recognizes polyphonic music from microphone (other Wave input or file) and converts it into Midi sequences. You can sing, whistle or play guitar, piano, flute and so on with your microphone,... Neither a Midi keyboard nor any musical experience are required to compose music. ... It will take into consideration individual performance style by tracking note dynamics and pitch bends.
http://www.akoff.com/composer.zip - 208Kb - Download - Screenshot

MID 2 WAV
Convert MID files into WAV files with one click! MIDI files only contain information about the notes to play. This means mid files will play different on every sound card and you can not burn mid files on a music CD or copy it to your mp3 player. This program records the midi output of your... If you compose your own music with a midi sequencer you will be able to burn your music on a music cd or import it to your wave editor to mix it with other samples.
http://www.cadkas.de/mid2wav!.exe - 340Kb - Download - Screenshot

Fractal Tune Smithy
Create beautiful music effortlessly - and discover your talent as a budding composer! Choose one of the tunes that come with the program or enter a very short musical phrase of a few notes, and hear it transformed into an intricate tracery of music. The music is fractal which means it is highly... Suitable even for complete newbies to composing - and there is no need to be able to read music notation. ... Try tunings for Indonesian Gamelans, or Indian music with drones. ... Play in any of the tunings and temperaments yourself with a music keyboard.
http://www.robertinventor.com/FTS_Setup.exe - 4Mb - Download - Screenshot

FlexiMusic Kids Composer
FlexiMusic Kids Composer is an amazing program that allows you to create music on your PC. Using a paintbrush, an erase tool and a mouse, it's a fun and easy way to make songs come alive. Select music samples called "Beats", and tunes called "Stars," then paint them on a track. ... FlexiMusic Kids Composer is best suited for children who would like to practice mixing a variety of instruments, and composing their own music. ... When you buy FlexiMusic Kids Composer, we will include the amazing FlexiMusic Kids Music orld program for your 5 year olds.
http://www.flexmusic.com/download/FlexiMusicKidsComposerSetup.exe - 6Mb - Download - Screenshot